EP0796550B1 - Plasma jet converging system - Google Patents
Plasma jet converging system Download PDFInfo
- Publication number
- EP0796550B1 EP0796550B1 EP95936910A EP95936910A EP0796550B1 EP 0796550 B1 EP0796550 B1 EP 0796550B1 EP 95936910 A EP95936910 A EP 95936910A EP 95936910 A EP95936910 A EP 95936910A EP 0796550 B1 EP0796550 B1 EP 0796550B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- passage
- passages
- axis
- plasma
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/26—Plasma torches
- H05H1/32—Plasma torches using an arc
- H05H1/44—Plasma torches using an arc using more than one torch
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/26—Plasma torches
- H05H1/32—Plasma torches using an arc
- H05H1/34—Details, e.g. electrodes, nozzles
- H05H1/3478—Geometrical details
Definitions
- said body portion will include tapered fins positioned one between adjacent sides of adjacent gas passages, each said tapering fin having its wider end adjacent upstream ends of said gas passages relative to the direction of flow of plasma gas, coolant passages through each said fin, said coolant passages extending between said upstream ends of said fins and blind passages extending through said fins toward said central axis and spaced downstream of said upstream ends of said fins.
- Figure 4 is a section along the line 4-4 in Figure 1 with the axial reactant passage illustrated for orientation.
- Figure 6 is a view similar to Figure 3 but showing a modified version of the present invention.
- the upper surface 22 of the block or body member 10, in the version illustrated in Figures 2 and 3, is provided with torch receiving cavities, 24, 26 and 28, symmetrically arranged in uniformly spaced relationship around the axis 14, having their centres (since in the illustrated arrangement, the cavities 24, 26 and 28 are shown as circular) spaced at 120° intervals relative to each other around the axis 14
- passages 36 converge toward the axis 14 from their upstream ends in their cavities 24, 26 or 28 respectively to their downstream ends adjacent to the outlet from the passage 16 in the position where they discharge plasma gases into a converging zone 48 (see Figure 1).
- holes or passages 52 extend completely through the block or body 10 and discharge into a chamber 56 within the housing 12 and surrounding the block 10.
- the block 10 in the illustrated arrangement is tapered, as indicated at 58, toward its downstream end 78.
- This manner of shaping the cross sectional shape of the passages 36 so that each is elongated in the direction perpendicular to the minor axis 40 better ensures trapping of the reactive material in the stream issuing from the passage 36 within the plasma stream.
- This shape coupled with the size or lateral dimension L relative to the minor axis 38 of the passage 36, i.e. 2D is ⁇ L where D is the diameter of the outlet 16 and L/2 is the distance that each passage 36 extend on each side of the minor axis 38 measured parallel to the plane 74.
- the plasma gas is introduced as indicated by the arrow 100 from any suitable source (one or more torches) and is directed along the parallel plasma conducting passages 102 and 104 formed in a body member 106.
- Each of the passages 102 and 104 connects with its respective plasma gas passage 108 and 110 which extend at an angle from their passages 102 and 104.
- the passages 108 and 110 are equivalent to a pair of converging passages 36 described above and thus require no further description.
Description
Claims (7)
- A plasma jet directing system for directing a plurality of plasma jets into converging relationship to entrap a reactant stream, comprising a body portion (10) having a central reactant injection passage means (16) extending substantially concentric with a central axis (14), at least two plasma gas passages (36), each passage having an inlet end (34) and an outlet end (70), the gas passages (36) converging toward each other and toward the central passage means (16) in a direction of flow of plasma gases which flow through the converging gas passages (36) from the inlet end (34) to the outlet end (70), the gas passages (36) being symmetrically positioned relative to the central axis (14), each of the gas passages (36) having a longitudinal axis (50) extending axially and converging in the direction of flow toward the central axis (14) at an acute angle, characterized in that said gas passages have a minor axis (40) substantially radial to the central axis (14) and a major axis (38) substantially perpendicular to the minor axis (40) and to its the longitudinal axis (50) at their point of intersection, each minor axis (40) being shorter than its major axis (38) so that each gas passage (36) has a cross sectional shape that is symmetrically elongated on opposite sides of its minor axis (40), each gas passage (36) having a plasma jet shaping wall (72) defining a major side of its passage at its gas passage's outlet end (70), the jet shaping wall (72) being spaced from an imaginary plane (74) extending substantially perpendicular to the minor axis (40) and positioned adjacent its outlet end (70) between the jet shaping wall (72) and the central axis (14), the imaginary plane (74) being spaced at an intersection of the minor axis (40) with the jet shaping wall (72) by a distance equal to or greater than the spacing between the plane (74) and points of the jet shaping wall (72) on opposite sides of the minor axis (40).
- A plasma jet directing system according to claim 1, characterised in that the central reactant injection passage means (16) comprises a single injection passage (16) concentric with the central axis (14).
- A plasma jet directing system according to claim 1, characterised in that the jet shaping wall (72) of each gas passage (36) comprises an inner wall (72) of its the gas passage (36) adjacent to the central axis (14).
- A plasma jet directing system according to any preceding claim, characterised in that the body portion (10) includes tapered fins (62) positioned one between adjacent sides of adjacent gas passages (36), each tapered fin (62) having its wider end adjacent the upstream ends of the gas passages (36) relative to the direction of flow of plasma gas therethrough, coolant passages (52A) through each fin (62), the coolant passages (52A) extending between the upstream ends of the fins (62) and a blind passage extending through the fin (62) toward the central axis (14) and spaced downstream of the upstream ends of the fins (62).
- A plasma jet directing system according in any preceding claim, characterised in that the intersection of the minor axis (40) with the shaping wall (72) of each passage (36) is spaced farther from the plane (74) than other points on the inner wall (72).
- A plasma jet directing system according to any preceding claim, characterised in that a projected length L of the shaping wall (72) measured along the plane (74) projects outside of the central reactant injection passage means (16) by a distance of at least 1/2 the minimum diameter D of an adjacent portion of the passage means (16).
- A plasma jet directing system according to any preceding claim, characterised in that length lmaj of the major axis (38) will be equal to or greater than 1.5 X the length lmin of the minor axis (40) of the gas passage (36) at the outlet end (70).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US352709 | 1994-12-05 | ||
US08/352,709 US5556558A (en) | 1994-12-05 | 1994-12-05 | Plasma jet converging system |
PCT/CA1995/000663 WO1996018283A1 (en) | 1994-12-05 | 1995-11-29 | Plasma jet converging system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0796550A1 EP0796550A1 (en) | 1997-09-24 |
EP0796550B1 true EP0796550B1 (en) | 1998-10-14 |
Family
ID=23386168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95936910A Expired - Lifetime EP0796550B1 (en) | 1994-12-05 | 1995-11-29 | Plasma jet converging system |
Country Status (7)
Country | Link |
---|---|
US (1) | US5556558A (en) |
EP (1) | EP0796550B1 (en) |
JP (1) | JP3878670B2 (en) |
AU (1) | AU3920295A (en) |
CA (1) | CA2205578C (en) |
DE (1) | DE69505417T2 (en) |
WO (1) | WO1996018283A1 (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6114649A (en) * | 1999-07-13 | 2000-09-05 | Duran Technologies Inc. | Anode electrode for plasmatron structure |
US6202939B1 (en) | 1999-11-10 | 2001-03-20 | Lucian Bogdan Delcea | Sequential feedback injector for thermal spray torches |
US6392189B1 (en) | 2001-01-24 | 2002-05-21 | Lucian Bogdan Delcea | Axial feedstock injector for thermal spray torches |
US6669106B2 (en) | 2001-07-26 | 2003-12-30 | Duran Technologies, Inc. | Axial feedstock injector with single splitting arm |
JP4449645B2 (en) * | 2004-08-18 | 2010-04-14 | 島津工業有限会社 | Plasma spraying equipment |
WO2006116844A1 (en) * | 2005-05-02 | 2006-11-09 | National Research Council Of Canada | Method and apparatus for fine particle liquid suspension feed for thermal spray system and coatings formed therefrom |
DE102007041329B4 (en) | 2007-08-31 | 2016-06-30 | Thermico Gmbh & Co. Kg | Plasma torch with axial powder injection |
FR2922406A1 (en) | 2007-10-12 | 2009-04-17 | Commissariat Energie Atomique | LIQUID CHARGE INJECTION DEVICE FOR MIXING / CONVERTING WITHIN A DARD PLASMA OR A GASEOUS FLOW |
WO2009143626A1 (en) * | 2008-05-29 | 2009-12-03 | Northwest Mettech Corp. | Method and system for producing coatings from liquid feedstock using axial feed |
FR2943209B1 (en) | 2009-03-12 | 2013-03-08 | Saint Gobain Ct Recherches | PLASMA TORCH WITH LATERAL INJECTOR |
US8237079B2 (en) * | 2009-09-01 | 2012-08-07 | General Electric Company | Adjustable plasma spray gun |
US9315888B2 (en) | 2009-09-01 | 2016-04-19 | General Electric Company | Nozzle insert for thermal spray gun apparatus |
KR101996433B1 (en) * | 2012-11-13 | 2019-07-05 | 삼성디스플레이 주식회사 | Thin film forming apparatus and the thin film forming method using the same |
US9272360B2 (en) | 2013-03-12 | 2016-03-01 | General Electric Company | Universal plasma extension gun |
DE102014221735A1 (en) * | 2014-10-24 | 2016-04-28 | Mahle Lnternational Gmbh | Thermal spraying method and device therefor |
US11560627B2 (en) * | 2017-05-23 | 2023-01-24 | Starfire Industries Llc | Atmospheric cold plasma jet coating and surface treatment |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4136273A (en) * | 1977-03-04 | 1979-01-23 | Nippon Steel Corporation | Method and apparatus for tig welding |
US4818837A (en) * | 1984-09-27 | 1989-04-04 | Regents Of The University Of Minnesota | Multiple arc plasma device with continuous gas jet |
JPS63230300A (en) * | 1987-03-18 | 1988-09-26 | Murata Mfg Co Ltd | Production of dehydrated cake |
FI86333C (en) * | 1988-04-11 | 1992-07-10 | Ahlstroem Oy | FOERFARANDE OCH ANORDNING FOER SEPARERING AV GAS MED PUMPEN UR MEDIET SOM SKALL PUMPAS. |
EP0351847A3 (en) * | 1988-07-21 | 1991-03-20 | Nippon Steel Corporation | Modular segmented cathode plasma generator |
US5298835A (en) * | 1988-07-21 | 1994-03-29 | Electro-Plasma, Inc. | Modular segmented cathode plasma generator |
US5144110A (en) * | 1988-11-04 | 1992-09-01 | Marantz Daniel Richard | Plasma spray gun and method of use |
US4982067A (en) * | 1988-11-04 | 1991-01-01 | Marantz Daniel Richard | Plasma generating apparatus and method |
EP0399387B1 (en) * | 1989-05-24 | 1992-09-30 | Vickers Incorporated | Rotary vane machine |
US5235160A (en) * | 1990-03-22 | 1993-08-10 | Matsushita Electric Industrial Co., Ltd. | Heat-plasma-jet generator capable of conducting plasma spray or heat-plasma cvd coating in a relatively wide area |
US5008511C1 (en) * | 1990-06-26 | 2001-03-20 | Univ British Columbia | Plasma torch with axial reactant feed |
US5420391B1 (en) * | 1994-06-20 | 1998-06-09 | Metcon Services Ltd | Plasma torch with axial injection of feedstock |
-
1994
- 1994-12-05 US US08/352,709 patent/US5556558A/en not_active Expired - Lifetime
-
1995
- 1995-11-29 JP JP51721096A patent/JP3878670B2/en not_active Expired - Fee Related
- 1995-11-29 CA CA002205578A patent/CA2205578C/en not_active Expired - Lifetime
- 1995-11-29 DE DE69505417T patent/DE69505417T2/en not_active Expired - Lifetime
- 1995-11-29 EP EP95936910A patent/EP0796550B1/en not_active Expired - Lifetime
- 1995-11-29 AU AU39202/95A patent/AU3920295A/en not_active Abandoned
- 1995-11-29 WO PCT/CA1995/000663 patent/WO1996018283A1/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
US5556558A (en) | 1996-09-17 |
CA2205578C (en) | 2005-06-28 |
EP0796550A1 (en) | 1997-09-24 |
JP3878670B2 (en) | 2007-02-07 |
JPH10509652A (en) | 1998-09-22 |
AU3920295A (en) | 1996-06-26 |
WO1996018283A1 (en) | 1996-06-13 |
DE69505417T2 (en) | 1999-03-25 |
CA2205578A1 (en) | 1996-06-13 |
DE69505417D1 (en) | 1998-11-19 |
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